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posStart and count values in dhtmlxgrid

I am using SmartRendering in dhtmlxgrid and want to refresh the visible rows periodically. I'm thinking that doing a loadXML() with posStart and count set will do this for me but I cannot find how to get the values for posStart and count. Is there a method for this or maybe another way of refreshing the visible rows in my grid?

Thanks,

Mel

grid.getStateOfView() returns array with next data
 - start
 - count
 - limit

>>and want to refresh the visible rows periodically
Just use updateFromXML instead of load
load command can't update already loaded data ( you can clear old data and reload new only ), updateFromXML changes data in already rendered rows from incoming XML